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Diet habits and trophic ecology of Rio Grande Sucker and Rio Grande Chub

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Abstract

Freshwater fishes are among the most imperiled organismal groups in the world and efforts to conserve many species are hindered by a lack of basic information pertaining to the diet habits and trophic relationships of various fish species. The purpose of this study was to fill knowledge gaps pertaining to the feeding habits and trophic ecology of Rio Grande chub (Gila pandora) and Rio Grande sucker (Catostomus plebeius) to aid in their conservation and protection. Specifically, we conducted (1) a literature review of the feeding habits of Rio Grande chub and Rio Grande sucker to summarize existing information and (2) a field study to quantify the describe the feeding habits and trophic relationships of these chub and sucker species. Review of previously published literature revealed no empirical diet studies for Rio Grande chub and only two studies for Rio Grande sucker. Statements about the diet habits of each fish species were vague and repeated through published gray and peer-reviewed literature. Findings from our field study provided far greater detail about each species diet composition and diet overlap. Rio Grande chub primarily fed on aquatic macroinvertebrates whereas Rio Grande sucker primarily consumed stream periphyton, and to a lesser degree, benthic macroinvertebrates. Both species selected aquatic Coleoptera larvae relative to prey availability. Our findings provide a clearer understanding of the feeding habits and trophic relationships and can be used to guide restoration or enhancement efforts to help maintain and improve the viability of their populations.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

We thank TTU, the Department of Natural Resources Management, and the Davis College of Agricultural Science and Natural Resources for supporting this research project. We also thank T. Ausec, J. Ivie, A. Norton, and B. Robertory for their help in the field. Furthermore, we thank the members of the Collins Lab for their feedback over the duration of the project.

Funding

Funding and support was provided by the Department of Natural Resources Management, along with the Davis College of Agricultural Science and Natural Resources at Texas Tech University. The authors did not receive external funding support from any organization for the submitted work.

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OG: conceptualization (lead), methodology (equal), formal analysis (equal), investigation (equal), writing original draft (lead), visualization (equal); SFC: investigation (equal), resources (lead), data curation (lead), writing (review and editing), supervision (lead), and project administration (lead).

Corresponding author

Correspondence to Scott F. Collins.

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All procedures involving animals were approved by TTU Institutional Animal Care and Use Committee (T20016) and New Mexico Department of Game and Fish (3762).

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Appendix

Appendix

Table 6

Table 6 Average mass (mg/fish) of diet items consumed by Rio Grande sucker (RGS; Catostomus plebeius; n = 89) and Rio Grande chub (RGC; Gila pandora; n = 63). Diets that contained macroinvertebrates that were too digested to identify to Family were categorized as “unknown.” Diets were collected from between early July to late September 2020 in five streams in the Santa Fe National Forest, NM (USA)

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George, O., Collins, S.F. Diet habits and trophic ecology of Rio Grande Sucker and Rio Grande Chub. Environ Biol Fish 106, 1669–1684 (2023). https://doi.org/10.1007/s10641-023-01443-9

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